21002214001 has 16 divisors (see below), whose sum is σ = 22636931328. Its totient is φ = 19413990400.

The previous prime is 21002213993. The next prime is 21002214029. The reversal of 21002214001 is 10041220012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002214001 - 2³ = 21002213993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002214061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284361 + ... + 350521.

It is an arithmetic number, because the mean of its divisors is an integer number (1414808208).

Almost surely, 2^21002214001 is an apocalyptic number.

It is an amenable number.

21002214001 is a deficient number, since it is larger than the sum of its proper divisors (1634717327).

21002214001 is a wasteful number, since it uses less digits than its factorization.

21002214001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66512.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002214001 its reverse (10041220012), we get a palindrome (31043434013).

The spelling of 21002214001 in words is "twenty-one billion, two million, two hundred fourteen thousand, one".